In radical chlorination of alkanes, non-equivalent hydrogens react with chlorine atoms at different rates. at 35 °c, primary, secondary, and tertiary c-h bonds react at relative rates of 1 : 3.9 : 5.

In radical chlorination of alkanes, non-equivalent hydrogens react with chlorine atoms at different rates. at 35 °c, primary, secondary, and tertiary c-h bonds react at relative rates of 1 : 3.9 : 5.2 respectively. these are conditions of kinetic control where product ratios are determined by relative rates of formation. for example, if a is formed twice as fast as b, the a:b product ratio will be 2. consider chlorination of the alkane below at 35 °c.